... Yet scores of us have jacked successfully in-between the spring U-bolts without issue of bending anything, messing up camber, and so on. A percentage of the weight of a trailer is sitting on top of the axle (yes I know ... on a spring perch) near the spindle it's entire life, so why would jacking up directly beneath that point be any different as far
as weight goes? Most spindles extend a few inches into the axle tube before it is welded to the end, so it's not like your are jacking on a hollow tube. I will agree that jacking up on an axle clear toward the center is really asking for trouble and I honestly believe that's how all this "don't jack on the axle" warning from manufacturers got started. I just couldn't keep it zipped here ...